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MAX6954 Datasheet(Hoja de datos) 5 Page - Maxim Integrated Products

No. de Pieza. MAX6954
Descripción  4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
Descarga  38 Pages
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Fabricante  MAXIM [Maxim Integrated Products]
Página de inicio  http://www.maxim-ic.com
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 5 page
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4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, TA = +25°C, unless otherwise noted.)
DEAD CLOCK OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
85
95
105
110
80
2.5
5.5
RSET = 56kΩ
OSC = GND
100
90
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
0.94
0.98
1.00
1.02
0.92
2.5
5.5
VLED = 1.8V
0.96
1V/div
200
µs/div
MAX6954 toc06
O0
O18
WAVEFORM AT PINS O0 AND O18,
MAXIMUM INTENSITY
0V
0V
GPIO SINK CURRENT
vs. TEMPERATURE
TEMPERATURE (
°C)
110
50
80
20
-10
5
10
15
20
25
30
35
40
45
0
-40
VCC = 3.3V
VCC = 2.5V
VCC = 5.5V
OUTPUT = LOW
VPORT = 0.6V
PORT INPUT PULLUP CURRENT
vs. TEMPERATURE
TEMPERATURE (
°C)
110
50
80
20
-10
0.05
0.10
0.15
0.20
0.25
0.30
0
-40
VCC = 3.3V
VCC = 2.5V
VCC = 5.5V
OUTPUT = HIGH
VPORT = 1.4V
400
µs/div
KEY_A: 1V/div
IRQ: 2V/div
MAX6954 toc09
KEY_A
0V
0V
IRQ
KEYSCAN OPERATION
(KEY_A AND IRQ)




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